Which of the following would be an example of gene expression? Select all that apply

Question

A) Control of insulin expression so it gives a signal for blood glucose regulation
B) Induction by an external influence to facilitate having a male child
C) Increasing the amount of UV light exposure to end up with darker skin
D) Activation of growth control genes by injecting growth hormone into a small for age male child

Answer 1

Ans: A, C
Feedback:
The degree to which a gene or particular group of genes is active is called gene expression. A phenomenon termed induction is an important process by which gene expression is increased. Gene repression is a process by which a regulatory gene acts to reduce or prevent gene expression. Activator and repressor sites commonly monitor levels of the synthesized product and regulate gene transcription through a negative feedback mechanism. Whenever product levels decrease, gene transcription is increased, and when product levels increase, gene transcription is repressed. Control of insulin expression so it gives a signal for blood glucose regulation and increases the amount of UV light exposure to end up with darker skin are examples of the negative feedback system.